Path.chmod(mode) 
Change the file mode and permissions, like os.chmod():
>>> p = Path('setup.py')
>>> p.stat().st_mode
33277
>>> p.chmod(0o444)
>>> p.stat().st_mode
33060
Path.chmod(mode) 
Change the file mode and permissions, like os.chmod():
>>> p = Path('setup.py')
>>> p.stat().st_mode
33277
>>> p.chmod(0o444)
>>> p.stat().st_mode
33060
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